The Logarithmic Decrement of HgTl Amalgam AT 39.9% At. Tl is Located in the Phase Diagram on the Right Side of 40% At. Tl

Abstract

By means of a toroidal oscillating viscometer logarithmic decrements of dampings have been measured in the presence or absence of HgTl amalgam at 39.9 atomic percent of thallium at different temperatures, ranging from-1°C to + 15.625°C, with fluctuations every 0.25°C. Measurements were performed in two different periods (1:05/04/1991-31/07/1991 and 2:01/08/1991-24/12/1991). In both periods, the eutectic was found at 1.125°C. When comparing 39.9% at. Tl and 40% at. Tl amalgams, values of the eutectic are perfectly coincident. The logarithmic decrement of the 39.9% at. Tl is located, in the phase diagram, on the right side with respect to the 40% at. Tl.

Key Words:

• Phase diagram
• viscometer damping.